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    Question

    Pipe A can fill a tank in 10 hours, while Pipe B can

    fill it in 15 hours. Pipe C can empty the tank in 12 hours. If all three pipes are opened together, how long will it take to fill the tank?
    A 10 hours Correct Answer Incorrect Answer
    B 12 hours Correct Answer Incorrect Answer
    C 15 hours Correct Answer Incorrect Answer
    D 18 hours Correct Answer Incorrect Answer

    Solution

    1/A + 1/B - 1/C = 1/10 + 1/15 - 1/12 = 1/12. Time = 12 hours. Correct Option: b)

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